. >> reporter: but after benghazi, the u.s. ambassador to libya assassinated, three more americans murdered, with egypt run by islamists, syria out of control, mitt romney campaigning in colorado blames barack obama. >> these are not bumps in the road, these are human lives. these are developments we do not want to see. this is time for a president who will shape events in the middle east. >> reporter: in our presidential election, romney is trailing in colorado. and in ohio, a must-win state for him where he campaigns tomorrow. >> look, we're going to win. there's no question in my mind. we're going to win. >> reporter: six weeks to go. one reason president obama is limiting diplomatic time at the u.n. i'm steve handelsman, nbc news, washington. >>> iran's president had harsh words for israel and the united states during his address to the united nations today in new york. ahmadinejad accused the united states of shielding a fake regime, meaning israel. in reference to the anti-islam video produced in the u.s., he also said is